Todd--IF!!! the service is good, we always tip around 20% regardless. What happens if the service is NOT good? The matter of tipping in general, worldwide, is out of control.
We're supposed to tip now for self-service? But I digress....
I resent auto-tip in general. And I surely resent them charging 20% and then the owner and a server denying it online, other than for large parties. I cannot conceive how one server could charge an auto-tip for every check, even though it's not allowed, and the owner not become aware of it.